[quote=Dark Jack]
Don't worry about working out a detailed explanation for Thessaleia, a brief sentence or two about what kind of kingdom it is would suffice quite fine for the time being; with lands that far west the influence it has on the eastern lands is almost nonexistent, and the probability of the characters ever going there would not be very high (it could happen, though... in case of which you may have to explain in more detail later on, when it becomes relevant). If the alternative is that the Éireannach would raid the Xuhrl-njok repeatedly, eventually leading to their destruction, then inserting Thessaleia between the two would probably be a good solution (then it would the Thessaleia being raided by Xuhrl-njok, too, instead of the Éireannach).
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Will do. I'll get something on the Kingdom of Thessaleia soon, if that's cool with you folks.

[quote=Dark Jack]
That's fine; humans and Nightwalkers are only compatible with one another, too, and no other races, so it would make sense for the Éireannach to have a similar relationship with them. How do these crossbreeds turn out, though? As Shien just pointed out there is a backlash when crossing Nightwalker and human blood that cause them to lose their eyesight, but how does Éireannach blood mix with human? Nightwalker?
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Nightwalker crossbreeds might have the same issues with eyesight as they do with humans. Furthermore, I think that Nightwalker crossbreeds and human crossbreeds would both have skin issues - eczema, perhaps an increase in skin cancers, dermatitis, issues such as those. Also, there might be issues with the differing musculature of Éireannach and humans/Nightwalkers, mostly around the upper body joints - might be more susceptible to loose joints which would cause no end of sprains, torn muscles and possibly worse. 

[quote=Dark Jack]
I know that, which is why I changed my approach as I wrote my thoughts on that bit (I should have deleted and rewritten that entire paragraph rather than leaving in my confusing train of thought as I went from one thought to another). My concern wasn't that it was unrealistic for them to maintain their population while being constantly at war - well it was at first, until I realized I was presuming too much just based on their lifespan - but that the growth of their population would be even more unsurstainable than that of humans. I know that there are numerous factors that limit population growth, but the fact that the Éireannach could sustain their population with continuous replacements for numbers lost in constant war would suggest that there aren't many of such natural limitations for them, and with individuals living as long as they do... well, if they did not take losses from war, I imagine they would very quickly find themselves fighting among themselves, stricken with pandemic illnesses and/or suffering from widespread famine. I'm not saying that it's unrealistic or that I object to it, I merely noted the fact that as I saw it, the Éireannach would not be able to sustain themselves as a people if there were no one for them to fight.
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I'll think on things like population counts and birth rates and the like and discuss them with Shienvien and others.